MediaWiki:Common.css

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/* Ensure all wikitables are centered and border-collapse is set to separate */
body .mw-body .content table.wikitable {
    border-collapse: separate !important;
    margin-left: auto !important;
    margin-right: auto !important;
    display: table !important;
    box-sizing: border-box !important;
}

/* Make sure the text within the table is centered */
.wikitable td, .wikitable th {
    text-align: center !important;
}

/* Forcing the table to center by wrapping it in a div */
body .wikitable-wrapper {
    display: flex;
    justify-content: center;
    width: 100%;
}

body .wikitable-wrapper .wikitable {
    margin: 0 !important;
}